<?php

/**
 * This is the model class for table "{{article}}".
 *
 * The followings are the available columns in table '{{article}}':
 * @property integer $id
 * @property integer $category_id
 * @property integer $author_id
 * @property string $title
 * @property string $content
 * @property integer $status
 * @property string $tags
 * @property integer $hits
 * @property string $create_time
 * @property string $update_time
 */
class Article extends CActiveRecord {

    const STATUS_DRAFT = 1;
    const STATUS_PUBLISHED = 2;
    const STATUS_ARCHIVED = 3;

    private $_oldTags;

    /**
     * Returns the static model of the specified AR class.
     * @param string $className active record class name.
     * @return Article the static model class
     */
    public static function model($className = __CLASS__) {
        return parent::model($className);
    }

    /**
     * @return string the associated database table name
     */
    public function tableName() {
        return '{{article}}';
    }

    /**
     * @return array validation rules for model attributes.
     */
    public function rules() {
        // NOTE: you should only define rules for those attributes that
        // will receive user inputs.
        return array(
            array('title, content, status', 'required'),
            array('status', 'in', 'range' => array(1, 2, 3)),
            array('title', 'length', 'max' => 128),
            array('tags', 'match', 'pattern' => '/^[\w\s,]+$/', 'message' => 'Tags can only contain word characters.'),
            array('tags', 'normalizeTags'),
            array('id, category_id, author_id, title, content, status, tags, hits, create_time, update_time', 'safe', 'on' => 'search'),
        );
    }

    /**
     * @return array relational rules.
     */
    public function relations() {
        return array(
            'author' => array(self::BELONGS_TO, 'User', 'author_id'),
            'category' => array(self::BELONGS_TO, 'ArticleCategory', 'category_id'),
            'comments' => array(self::HAS_MANY, 'Comment', 'article_id', 'condition' => 'comments.status=' . Comment::STATUS_APPROVED, 'order' => 'comments.create_time DESC'),
            'commentCount' => array(self::STAT, 'Comment', 'article_id', 'condition' => 'status=' . Comment::STATUS_APPROVED),
        );
    }

    /**
     * @return array customized attribute labels (name=>label)
     */
    public function attributeLabels() {
        return array(
            'id' => 'ID',
            'category_id' => 'Category',
            'author_id' => 'Author',
            'title' => 'Title',
            'content' => 'Content',
            'status' => 'Status',
            'tags' => 'Tags',
            'hits' => 'Hits',
            'create_time' => 'Create Time',
            'update_time' => 'Update Time',
        );
    }

    /**
     * @return string the URL that shows the detail of the post
     */
    public function getUrl() {
        return Yii::app()->createUrl('article/view', array(
                    'id' => $this->id,
                    //'title' => $this->title,
                ));
    }

    /**
     * @return array a list of links that point to the post list filtered by every tag of this post
     */
    public function getTagLinks() {
        $links = array();
        foreach (Tag::string2array($this->tags) as $tag)
            $links[] = CHtml::link(CHtml::encode($tag), array('article/index', 'tag' => $tag));
        return $links;
    }

    /**
     * Normalizes the user-entered tags.
     */
    public function normalizeTags($attribute, $params) {
        $this->tags = Tag::array2string(array_unique(Tag::string2array($this->tags)));
    }

    /**
     * Adds a new comment to this post.
     * This method will set status and post_id of the comment accordingly.
     * @param Comment the comment to be added
     * @return boolean whether the comment is saved successfully
     */
    public function addComment($comment) {
        if (Yii::app()->params['commentNeedApproval'])
            $comment->status = Comment::STATUS_PENDING;
        else
            $comment->status = Comment::STATUS_APPROVED;
        $comment->article_id = $this->id;
        return $comment->save();
    }

    /**
     * This is invoked when a record is populated with data from a find() call.
     */
    protected function afterFind() {
        parent::afterFind();
        $this->_oldTags = $this->tags;
    }

    /**
     * This is invoked before the record is saved.
     * @return boolean whether the record should be saved.
     */
    protected function beforeSave() {
        if (parent::beforeSave()) {
            if ($this->isNewRecord) {
                $this->create_time = $this->update_time = time();
                $this->author_id = Yii::app()->user->id;
            }
            else
                $this->update_time = time();
            return true;
        }
        else
            return false;
    }

    /**
     * This is invoked after the record is saved.
     */
    protected function afterSave() {
        parent::afterSave();
        Tag::model()->updateFrequency($this->_oldTags, $this->tags);
    }

    /**
     * This is invoked after the record is deleted.
     */
    protected function afterDelete() {
        parent::afterDelete();
        Comment::model()->deleteAll('article_id=' . $this->id);
        Tag::model()->updateFrequency($this->tags, '');
    }

    /**
     * Retrieves a list of models based on the current search/filter conditions.
     * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
     */
    public function search() {
        // Warning: Please modify the following code to remove attributes that
        // should not be searched.

        $criteria = new CDbCriteria;

        $criteria->compare('id', $this->id);
        $criteria->compare('category_id', $this->category_id);
        $criteria->compare('author_id', $this->author_id);
        $criteria->compare('title', $this->title, true);
        $criteria->compare('content', $this->content, true);
        $criteria->compare('status', $this->status);
        $criteria->compare('tags', $this->tags, true);
        $criteria->compare('hits', $this->hits);
        $criteria->compare('create_time', $this->create_time, true);
        $criteria->compare('update_time', $this->update_time, true);

        return new CActiveDataProvider($this, array(
                    'criteria' => $criteria,
                ));
    }

}